EP0334898B1 - Peristaltic pump - Google Patents

Peristaltic pump Download PDF

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Publication number
EP0334898B1
EP0334898B1 EP88901228A EP88901228A EP0334898B1 EP 0334898 B1 EP0334898 B1 EP 0334898B1 EP 88901228 A EP88901228 A EP 88901228A EP 88901228 A EP88901228 A EP 88901228A EP 0334898 B1 EP0334898 B1 EP 0334898B1
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EP
European Patent Office
Prior art keywords
hose
rotor
pump
union
wall
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
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EP88901228A
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German (de)
French (fr)
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EP0334898A1 (en
Inventor
Fritz Kielwein
Manfred Streicher
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Crane Process Flow Technologies GmbH
Original Assignee
KWW Gesellschaft fuer Verfahrenstechnik mbH
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Priority to AT88901228T priority Critical patent/ATE62530T1/en
Publication of EP0334898A1 publication Critical patent/EP0334898A1/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B43/00—Machines, pumps, or pumping installations having flexible working members
    • F04B43/12—Machines, pumps, or pumping installations having flexible working members having peristaltic action
    • F04B43/1253—Machines, pumps, or pumping installations having flexible working members having peristaltic action by using two or more rollers as squeezing elements, the rollers moving on an arc of a circle during squeezing

Definitions

  • the invention relates to a hose pump, in which the restoring force for the hose is brought about by negative pressure in the suction space.
  • the separating device has a band which is mounted on the housing between the pressure and suction nozzle in a rotationally fixed manner and which extends from the front wall to the rear wall, in order thereby to seal the suction chamber from the pressure chamber.
  • the circumference of the band is somewhat larger than the circumference of the rotor and the band is firmly connected to the housing at a point between the suction and pressure ports.
  • the band is placed directly around the rotor and it is connected to the housing via a slide. The slide runs in a guide arranged between the suction and discharge ports, which is oriented towards the axis of the rotor.
  • the invention has for its object to provide a peristaltic pump in which the hose is reset by negative pressure in the suction chamber, in which pump it is ensured that the negative pressure is maintained
  • the peristaltic pump according to the invention has the features a) to e) listed above and is distinguished by the fact that there is no longer a non-rotatable sealing tape in which the rotor rotates, but that the separating device has a rotor sealing device which is firmly connected to the rotor is, so it rotates with this and the Seals runner against the front and rear wall.
  • the separating device has a rotor sealing device which is firmly connected to the rotor is, so it rotates with this and the Seals runner against the front and rear wall.
  • there is an elastic sealing device in the area between the suction and discharge ports which seals the cross-section between the rotor and the circumferential wall, as well as the front and rear wall, which changes constantly when rotating
  • Peristaltic pumps designed in this way have the advantage that sealing fluid is continuously transported by the rotating rotor sealing device, which means that the entire circumference of the rotor sealing device is always well sealed.
  • the sealing tape In the known pumps, in which the rotor rotated in the non-rotatably mounted sealing tape, the sealing tape only moved back and forth, which in part led to the sealing liquid being wiped away and not refilled, which resulted in leaks.
  • a hose pump according to the invention is particularly simple in construction if the elastic sealing device is formed by an elastic piece of hose, the axis of which is parallel to the axis of the rotor and which extends from the front wall to the rear wall of the housing.
  • this sealing device can only be used up to relatively low speeds. If reliable sealing is to be ensured even at high speeds, it is advantageous to use an elastic sealing device which is designed as a spring-loaded oscillating plate or spring-loaded slide.
  • the housings of all peristaltic pumps described here have two nozzles, of which the left one is referred to below as the suction nozzle 20 and the right one as the pressure nozzle 21.
  • the direction of rotation 22 corresponds to the counterclockwise direction in the illustrations. In all cases, however, the direction of rotation can be reversed without any problems, whereby the suction nozzle becomes the pressure nozzle and vice versa.
  • the two connecting pieces 20 and 21 are attached to a flat upper area 23.1 of the peripheral wall of the housing.
  • the peripheral wall also has a circular cylindrical squeeze area 23.2.
  • the two ends of the suction nozzle 20 and pressure nozzle 21 protruding into the pump interior are connected to one another via a hose 24 which does not have its own resilience.
  • the hose 24 is laid along the pinch area 23.2 of the peripheral wall. There, however, it does not lie directly on the metallic peripheral wall of the housing, but rather it rests on a cushion layer 25 which runs along the squeezing area 23.2.
  • a rotor 26 with three rotationally symmetrical crimping bodies is also arranged in the pump interior.
  • the rotor 26 and the squeeze body 27 form a cylindrical outer surface 28 on the outside.
  • a sealing ring 29 runs along each of the two edges of this outer surface 28.
  • One of these sealing rings 29 lies sealingly against the flat front wall 30 of the housing, while the other sealing ring rests against it the flat rear wall 31 abuts.
  • a piece of hose 33 is fastened between the suction port 20 and the pressure port 21 by means of fastening screws 23.
  • This lies with its axis parallel to the axis of the runner. It extends from the front wall 30 to the rear wall 31. Its elasticity, its diameter and the distance between the upper region 23.1 of the peripheral wall and the lateral surface 28 are selected such that the tube piece 33 always lies sealingly against the lateral surface 28, regardless of this whether a squeeze body 27 is running through, or such a location on the lateral surface that is less distant from the axis of the rotor than the vertex of a squeeze body 27.
  • FIG. 1 shows the state in which between the lateral surface 28 and the upper region 23.1 the circumferential wall has the smallest distance since a squeeze body 27 is passing right at the top.
  • the position of the tube piece 23 is drawn in dash-dotted lines, which it occupies when the lateral surface 28 is at the greatest distance from the upper region 23.1 of the peripheral wall.
  • a small amount of a lubricating and sealing liquid 34 is present in the interior of the pump, preferably silicone oil.
  • the circumference of the hose 24 is dimensioned such that it essentially corresponds to twice the distance between the front wall 30 and the rear wall 31.
  • FIGS. 3 and 4 show variations of the sealing part fastened to the upper region 23.1 of the peripheral wall, which is formed by the tube piece 33 in the embodiment according to FIGS. 1 and 2, in the embodiment 3, the sealing part is formed by a vibrating plate 36 and in the embodiment according to FIG. 4 by a slide 37.
  • the vibrating plate 36 of the embodiment according to FIG. 3 is connected to the upper region 23.1 of the peripheral wall via a joint 38. It is covered at the bottom with a sealing covering 39 which merges sealingly with the upper region 23.1 of the peripheral wall.
  • the sealing covering 39 seals against the outer surface 28 and the front wall 30 and the rear wall 31 and, moreover, the upper region 23.1. So that the vibrating plate 36 with the sealing covering 39 always lies tightly against the outer surface 28, it is pressed by a spring 40 in the direction of the outer surface 28.
  • the slide 37 extends over the entire width of the interior of the housing from the front wall 30 to the rear wall 31. It is oriented towards the axis of the rotor 26 and is displaceable in this direction in a guide 41 which is guided by the upper region 23.1 of the peripheral wall is firmly connected. The slide 37 is pressed onto the lateral surface 28 by the force of a spring 40.
  • FIGS. 3 and 4 have the advantage over the embodiment of FIG. 1 that the force of the spring 40 used in each case always ensures that the sealing part _ oscillating plate 36 or slide 37 _ lies securely on the lateral surface 28.
  • the construction with the tube piece 33 is particularly simple. It is sufficient for slow speeds.
  • the arrangement and number of the squeeze bodies used is not important in pumps according to the invention, as long as at least two squeeze bodies are used.
  • It can be stationary squeeze bodies, as shown in Fig. 1, or the squeeze bodies can be ball-bearing rollers.
  • the squeeze bodies can have a hard surface, or they can be provided with a cushion in accordance with the cushion layer 25 on the squish area 23.2 of the peripheral wall.
  • Such pads serve to ensure that larger pumped bodies are not smashed by the action of the squeeze body, but rather that if they are not easily pushed in the conveying direction, they are pressed into the padding layers as they pass through a squeeze body.
  • the pumps can be driven in any way. Drives with low starting torque can also be used, since only a low starting torque is required for all peristaltic pumps according to the invention, since no hard elastic, self-erecting hose has to be used.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Reciprocating Pumps (AREA)

Abstract

A preferred peristaltic pump differs from known peristaltic pumps in that its inner space is completely filled with a liquid (34). In that case, a slack hose (24) can be instead of a hard elastic, self-erecting hose, thus enabling a high number of revolutions and a consequent high output to be obtained with small dimensions. The suction height is automatically adjusted to the suction height required at that moment. The pump is able to extract even at a low number of revolutions, as long as there is no black-flow due to the squeeze-point on the hose. The hose that can be used in this case can be considerably better squeezed than a hard elastic, self-resorting hose.

Description

TECHNISCHES GEBIETTECHNICAL AREA

Die Erfindung betrifft eine Schlauchpumpe, bei der die Rückstellkraft für den Schlauch durch Unterdruck im Saugraum bewerkstelligt wird.The invention relates to a hose pump, in which the restoring force for the hose is brought about by negative pressure in the suction space.

STAND DER TECHNIKSTATE OF THE ART

Eine Schlauchpumpe mit folgenden Merkmalen ist aus DE-A-33 20 090 sowie aus EP-A-130 374 bekannt:

  • a) Einem Gehäuse mit
    • a1) einem Saugstutzen und einem Druckstutzen,
    • a2) einer Umfangswand, die zumindest in einem Quetschbereich entlang der langen Verbindung zwischen Saugstutzen und Druckstutzen kreiszylindrisch ausgebildet ist, und
    • a3) einer ebenen Vorderwand und einer ebenen Rückwand,
  • b) einem Schlauch,
    • b1) der zwischen dem Saugstutzen und dem Druckstutzen entlang der Umfangswand im Quetschbereich verläuft und
    • b2) dessen Umfang im wesentlichen dem doppelten Abstand zwischen Vorder- und Rückwand entspricht,
  • c) einem Läufer,
    • c1) dessen Drehachse mit der Achse des kreiszylindrischen Quetschbereichs der Umfangswand zusammenfällt,
    • c2) der mindestens zwei rotationssymmetrisch angeordnete Quetschkörper aufweist, und
    • c3) der sich so dreht, daß jeder Quetschkörper den Schlauch vom Bereich des Saugstutzens bis zum Bereich des Druckstutzens hin quetscht,
  • d) einer Dichtflüssigkeit im Inneren des Gehäuses und
  • e) einer Trenneinrichtung, die einen Saugraum, d.h. einen Raum im Pumpeninneren, in dem beim Pumpen Unterdruck herrscht, von einen Druckraum, in dem kein Unterdruck herrscht, dichtend abtrennt.
A peristaltic pump with the following features is known from DE-A-33 20 090 and from EP-A-130 374:
  • a) A housing with
    • a1) a suction port and a pressure port,
    • a2) a circumferential wall which is of circular cylindrical design at least in a squeeze area along the long connection between the suction port and the pressure port, and
    • a3) a flat front wall and a flat rear wall,
  • b) a hose,
    • b1) which runs between the suction port and the pressure port along the circumferential wall in the squeezed area and
    • b2) the circumference of which essentially corresponds to twice the distance between the front and rear walls,
  • c) a runner,
    • c1) whose axis of rotation coincides with the axis of the circular-cylindrical squeezing area of the peripheral wall,
    • c2) which has at least two rotationally symmetrically arranged squeeze bodies, and
    • c3) which rotates such that each squeeze body squeezes the hose from the area of the suction port to the area of the pressure port,
  • d) a sealing liquid inside the housing and
  • e) a separating device, which separates a suction space, ie a space inside the pump in which there is negative pressure during pumping, from a pressure space in which there is no negative pressure.

Bei den aus den genannten Schriften bekannten Schlauchpumpen verfügt die Trenneinrichtung über ein am Gehäuse zwischen Druck- und Saugstutzen verdrehfest montiertes Band, das sich von der Vorderwand bis zur Rückwand erstreckt, um dadurch den Saugraum gegenüber dem Druckraum abzudichten. Bei der Schlauchpumpe gemäß EP-A-130 374 ist der Umfang des Bandes einiges größer als der Umfang des Läufers und das Band ist an einer Stelle zwischen Saug- und Druckstutzen fest mit dem Gehäuse verbunden. Bei der Saugpumpe gemäß DE-A-33 20 090 ist das Band dagegen unmittelbar um den Läufer gelegt und es ist über einen Schieber mit dem Gehäuse verbunden. Der Schieber läuft in einer zwischen Saug- und Druckstutzen angeordneten Führung, die zur Achse des Läufers hin ausgerichtet ist.In the peristaltic pumps known from the cited documents, the separating device has a band which is mounted on the housing between the pressure and suction nozzle in a rotationally fixed manner and which extends from the front wall to the rear wall, in order thereby to seal the suction chamber from the pressure chamber. In the peristaltic pump according to EP-A-130 374, the circumference of the band is somewhat larger than the circumference of the rotor and the band is firmly connected to the housing at a point between the suction and pressure ports. In the suction pump according to DE-A-33 20 090, on the other hand, the band is placed directly around the rotor and it is connected to the housing via a slide. The slide runs in a guide arranged between the suction and discharge ports, which is oriented towards the axis of the rotor.

Es hat sich gezeigt, daß es bei den Schlauchpumpen mit dem genannten Aufbau verschiedentlich zu Dichtproblemen in bezug auf die Abdichteigenschaften der Trenneinrichtung kommt.It has been shown that there are various sealing problems in relation to the sealing properties of the separating device in the case of the peristaltic pumps with the structure mentioned.

Der Erfindung liegt die Aufgabe zugrunde, eine Schlauchpumpe anzugeben, bei der der Schlauch durch Unterdruck im Saugraum rückgestellt wird, bei welcher Pumpe sicher gewährleistet ist, daß der Unterdruck aufrechterhalten bleibtThe invention has for its object to provide a peristaltic pump in which the hose is reset by negative pressure in the suction chamber, in which pump it is ensured that the negative pressure is maintained

DARSTELLUNG DER ERFINDUNGPRESENTATION OF THE INVENTION

Die erfindungsgemäße Schlauchpumpe weist die oben aufgeführten Merkmals a) bis e) auf und zeichnet sich dadurch aus, daß nicht mehr ein verdrehfestes Dichtband vorhanden ist, in dem der Läufer umläuft, sondern daß die Trenneinrichtung über eine Läuferdichteinrichtung verfügt, die mit dem Läufer fest verbunden ist, sich also mit diesem dreht und dabei den Läufer gegenüber der Vorder- und Rückwand abdichtet. Zusätzlich ist eine elastische Dichteinrichtung im Bereich zwischen Saug- und Druckstutzen vorhanden, die den sich bei Drehung dauernd ändernden Querschnitt zwischen Läufer und Umfangswand sowie Vorder- und Rückwand abdichtetThe peristaltic pump according to the invention has the features a) to e) listed above and is distinguished by the fact that there is no longer a non-rotatable sealing tape in which the rotor rotates, but that the separating device has a rotor sealing device which is firmly connected to the rotor is, so it rotates with this and the Seals runner against the front and rear wall. In addition, there is an elastic sealing device in the area between the suction and discharge ports, which seals the cross-section between the rotor and the circumferential wall, as well as the front and rear wall, which changes constantly when rotating

Derartig ausgebildete Schlauchpumpen haben den Vorteil, daß durch die sich drehende Läuferdichteinrichtung dauernd Dichtflüssigkeit transportiert wird, was dazu führt, daß immer am ganzen Umfang der Läuferdichteinrichtung gut abgedichtet wird. Bei den bekannten Pumpen, bei denen sich der Läufer im verdrehfest montierten Dichtband drehte, bewegte sich das Dichtband nur hin und her, was teilweise dazu führte, daß Dichtflüssigkeit weggewischt und nicht nachgefördert wurde, wodurch es zu Undichtigkeiten kam.Peristaltic pumps designed in this way have the advantage that sealing fluid is continuously transported by the rotating rotor sealing device, which means that the entire circumference of the rotor sealing device is always well sealed. In the known pumps, in which the rotor rotated in the non-rotatably mounted sealing tape, the sealing tape only moved back and forth, which in part led to the sealing liquid being wiped away and not refilled, which resulted in leaks.

Eine erfindungsgemäße Schlauchpumpe ist dann besonders einfach aufgebaut, wenn die elastische Dichteinrichtung durch ein elastisches Schlauchstück gebildet ist, dessen Achse parallel zur Achse des Läufers liegt und das sich von der Vorderwand bis zur Rückwand des Gehäuses erstreckt. Diese Dichteinrichtung ist jedoch nur bis zu relativ niedrigen Drehzahlen brauchbar. Soll sicheres Abdichten auch noch bei hohen Drehzahlen gewährleistet sein, ist es von Vorteil, eine elastische Dichteinrichtung zu verwenden, die als federbelastete Schwingplatte oder federbelasteter Schieber ausgebildet ist.A hose pump according to the invention is particularly simple in construction if the elastic sealing device is formed by an elastic piece of hose, the axis of which is parallel to the axis of the rotor and which extends from the front wall to the rear wall of the housing. However, this sealing device can only be used up to relatively low speeds. If reliable sealing is to be ensured even at high speeds, it is advantageous to use an elastic sealing device which is designed as a spring-loaded oscillating plate or spring-loaded slide.

KURZE BESCHREIBUNG DER FIGURENBRIEF DESCRIPTION OF THE FIGURES

  • Fig. 1 Querschnitt durch eine Schlauchpumpe mit elastischem Schlauchstück als elastischem Dichtungsteil und mit abgedichtetem Läufer;1 shows a cross section through a hose pump with an elastic hose piece as an elastic sealing part and with a sealed rotor;
  • Fig. 2 Teil-Längsschnitt durch die Pumpe gemäß Fig. 1;Fig. 2 partial longitudinal section through the pump of FIG. 1;
  • Fig. 3 schematische Draufsicht auf wichtige Teile einer Schlauchpumpe entsprechend der von Fig 1, jedoch mit einer federbelasteten Schwingplatte als elastischem Dichtungsteil; und3 shows a schematic plan view of important parts of a hose pump corresponding to that of FIG. 1, but with a spring-loaded oscillating plate as an elastic sealing part; and
  • Fig. 4 Darstellung gemäß Fig. 3, jedoch mit einem federbelasteten Schieber als elastischem Dichtungsteil.Fig. 4 representation according to FIG. 3, but with a spring-loaded slide as an elastic sealing part.
WEGE ZUM AUSFOHREN DER ERFINDUNGWAYS OF EXECUTING THE INVENTION

Alle folgenden Ausführungsformen betreffen Schlauchpumpen mit einem Gehäuse, das entsprechend aufgebaut ist wie das Gehäuse der in der EP-A-130 374 ausführlich beschriebenen Pumpe. In bezug auf Details wird auf die Offenbarung in den genannten Patenten verwiesen.All of the following embodiments relate to peristaltic pumps with a housing which is constructed correspondingly to the housing of the pump described in detail in EP-A-130 374. For details, reference is made to the disclosure in the referenced patents.

Die Gehäuse aller hier beschriebenen Schlauchpumpen weisen zwei Stutzen auf, von denen im Folgenden der linke als Saugstutzen 20 und der rechte als Druckstutzen 21 bezeichnet wird. Die Drehrichtung 22 entspricht in den Darstellungen dem Gegen-Uhrzeigersinn. Die Drehrichtung kann jedoch in allen Fällen ohne weiteres umgekehrt werden, wodurch der Saugstutzen zum Druckstutzen wird und umgekehrt.The housings of all peristaltic pumps described here have two nozzles, of which the left one is referred to below as the suction nozzle 20 and the right one as the pressure nozzle 21. The direction of rotation 22 corresponds to the counterclockwise direction in the illustrations. In all cases, however, the direction of rotation can be reversed without any problems, whereby the suction nozzle becomes the pressure nozzle and vice versa.

Die beiden Stutzen 20 und 21 sind an einem ebenen oberen Bereich 23.1 der Umfangswand des Gehäuses befestigt. Die Umfangswand weist darüber hinaus einen kreiszylindrischen Quetschbereich 23.2 auf. Die beiden in den Pumpeninnenraum ragenden Enden von Saugstutzen 20 bzw. Druckstutzen 21 stehen über einen Schlauch 24 miteinander in Verbindung, der kein eigenes Rückstellvermögen aufweist. Auf seinem Weg zwischen den beiden Stutzen ist der Schlauch 24 entlang dem Quetschbereich 23.2 der Umfangswand verlegt. Er liegt dort jedoch nicht direkt an der metallischen Gehäuseumfangswand an, sondern er liegt auf einer Polsterschicht 25 auf, die entlang dem Quetschbereich 23.2 verläuft.The two connecting pieces 20 and 21 are attached to a flat upper area 23.1 of the peripheral wall of the housing. The peripheral wall also has a circular cylindrical squeeze area 23.2. The two ends of the suction nozzle 20 and pressure nozzle 21 protruding into the pump interior are connected to one another via a hose 24 which does not have its own resilience. On its way between the two connecting pieces, the hose 24 is laid along the pinch area 23.2 of the peripheral wall. There, however, it does not lie directly on the metallic peripheral wall of the housing, but rather it rests on a cushion layer 25 which runs along the squeezing area 23.2.

Bei der Ausführungsform gemäß den Figuren 1 und 2 ist im Pumpeninnenraum außerdem ein Läufer 26 mit drei rotationssymmetrisch aufgesetzten Quetschkörpern angeordnet. Der Läufer 26 und die Quetschkörper 27 bilden nach außen eine zylindrische Mantelfläche 28. Entlang der beiden Ränder dieser Mantelfläche 28 verläuft jeweils ein Dichtring 29. Der eine dieser Dichtringe 29 liegt abdichtend an der ebenen Vorderwand 30 des Gehäuses an, während der andere Dichtring abdichtend an der ebenen Rückwand 31 anliegt.In the embodiment according to FIGS. 1 and 2, a rotor 26 with three rotationally symmetrical crimping bodies is also arranged in the pump interior. The rotor 26 and the squeeze body 27 form a cylindrical outer surface 28 on the outside. A sealing ring 29 runs along each of the two edges of this outer surface 28. One of these sealing rings 29 lies sealingly against the flat front wall 30 of the housing, while the other sealing ring rests against it the flat rear wall 31 abuts.

Am oberen Bereich 23.1 der Umfangswand ist zwischen dem Saugstutzen 20 und dem Druckstutzen 21 mittels Befestigungsschrauben 23 ein Schlauchstück 33 befestigt. Dieses liegt mit seiner Achse parallel zur Achse des Läufers. Es erstreckt sich von der Vorderwand 30 bis zur Rückwand 31. Seine Elastizität, sein Durchmesser und der Abstand zwischen oberem Bereich 23.1 der Umfangswand und der Mantelfläche 28 sind so gewählt, daß das Schlauchstück 33 immer abdichtend an der Mantelfläche 28 anliegt, und zwar unabhängig davon, ob gerade ein Quetschkörper 27 durchläuft, oder eine solche Stelle der Mantelfläche, die von der Achse des Läufers weniger weit beabstandet ist als der Scheitelpunkt eines Quetschkörpers 27. In Fig. 1 ist der Zustand dargestellt, in dem zwischen Mantelfläche 28 und oberem Bereich 23.1 der Umfangswand der geringste Abstand besteht, da gerade ein Quetschkörper 27 ganz oben durchläuft. Strichpunktiert ist die Stellung des Schlauchstückes 23 eingezeichnet, die dieses einnimmt, wenn die Mantelfläche 28 den größten Abstand vom oberen Bereich 23.1 der Umfangswand aufweist.On the upper area 23.1 of the peripheral wall, a piece of hose 33 is fastened between the suction port 20 and the pressure port 21 by means of fastening screws 23. This lies with its axis parallel to the axis of the runner. It extends from the front wall 30 to the rear wall 31. Its elasticity, its diameter and the distance between the upper region 23.1 of the peripheral wall and the lateral surface 28 are selected such that the tube piece 33 always lies sealingly against the lateral surface 28, regardless of this whether a squeeze body 27 is running through, or such a location on the lateral surface that is less distant from the axis of the rotor than the vertex of a squeeze body 27. FIG. 1 shows the state in which between the lateral surface 28 and the upper region 23.1 the circumferential wall has the smallest distance since a squeeze body 27 is passing right at the top. The position of the tube piece 23 is drawn in dash-dotted lines, which it occupies when the lateral surface 28 is at the greatest distance from the upper region 23.1 of the peripheral wall.

Um ein gutes Abdichten aller genannten Teile gegeneinander zu gewährleisten, ist eine geringe Menge einer Schmier- und Dichtflüssigkeit 34 in Pumpeninneren vorhanden, vorzugsweise Silikonöl. Außerdem ist der Umfang des Schlauches 24 so bemessen, daß er im wesentlichen dem doppelten Abstand zwischen der Vorderwand 30 und der Rückwand 31 entspricht.In order to ensure a good sealing of all the parts mentioned against one another, a small amount of a lubricating and sealing liquid 34 is present in the interior of the pump, preferably silicone oil. In addition, the circumference of the hose 24 is dimensioned such that it essentially corresponds to twice the distance between the front wall 30 and the rear wall 31.

Diese Schlauchpumpe gemäß den Figuren 1 und 2 arbeitet wie folgt.This peristaltic pump according to Figures 1 and 2 works as follows.

Beim Umlaufen des Läufers 26 trifft ein Quetschkörper 27 nach dem anderen auf den Schlauch 24 unterhalb dem Saugstutzen 20, quetscht beim Weiterlaufen den Schlauch zusammen und läuft dann am zusammengequetschten Schlauch bis in den Bereich unterhalb dem Druckstutzen 21 entlang. Wenn ein Quetschkörper 27 unterhalb dem Saugstutzen 20 den Schlauch 24 zusammengequetscht hat und sich dann ein Stück weiterbewegt, hat der Schlauch, von dem hier angenommen wird, daß in seinem Inneren Unterdruck herrscht, zwei Möglichkeiten, nämlich entweder im zusammengequetschten Zustand zu verharren, oder sich wieder aufzurichten. Würde er im zusammengequetschten Zustand verharren, würde das von Bauteilen freie Volumen zwischen Mantelfläche 28, Schlauchstück 33, Vorderwand 30, Rückwand 31 und Schlauch 24 in dessen Bereich zwischen dem Saugstutzen 20 und der Aufsetzlinie des Quetschkörpers 27 vergrößert werden. Dadurch würde ein immer stärkerer Unterdruck im Saugbereich, d.h. dem soeben beschriebenen Volumen im Pumpeninneren, entstehen. Dieser angenommene Vorgang tritt tatsächlich ein, jedoch nur solange, bis der Unterdruck im Saugbereich 35 dem Unterdruck im Schlauch 24 entspricht. Läuft ausgehend von diesem Zustand der Quetschkörper 27 weiter, wird nicht mehr das freie Volumen des Saugbereichs 35 und damit der dort herrschende Unterdruck größer, sondern nun bläht sich der Schlauch 24 nach dem Durchlaufen des jeweiligen Quetschkörpers 27 zu jedem Zeitpunkt soweit auf, daß das Volumen im Saugbereich 35 erhalten bleibt. Da sich der Unterdruck im Saugbereich 35 automatisch dem Innendruck im Schlauch 24 anpaßt, paßt sich die Pumpe gemäß den Figuren 1 und 2 automatisch an die jeweils erforderliche Saughöhe an.When the rotor 26 rotates, one squeeze body 27 after the other hits the hose 24 below the suction nozzle 20, squeezes the hose together as it continues to run, and then runs along the squeezed hose to the area below the pressure nozzle 21. If a squeeze body 27 has squeezed the hose 24 below the suction nozzle 20 and then moves a little further, the hose, which is assumed here to be underpressure, has two possibilities, namely either to remain in the crimped state, or to move to erect again. If it remained in the crimped state, the volume free of components between the outer surface 28, the hose section 33, the front wall 30, the rear wall 31 and the hose 24 would be increased in the area between the suction port 20 and the line of contact of the squeeze body 27. This would increase the vacuum in the suction area, i.e. the volume just described inside the pump. This assumed process actually occurs, but only until the negative pressure in the suction area 35 corresponds to the negative pressure in the hose 24. If the squeeze body 27 continues from this state, the free volume of the suction area 35 and thus the negative pressure prevailing there no longer becomes larger, but now the tube 24 inflates after passing through the respective squeeze body 27 to such an extent that the volume remains in the suction area 35. Since the negative pressure in the suction area 35 automatically adapts to the internal pressure in the hose 24, the pump adapts itself automatically to the required suction height according to FIGS. 1 and 2.

In den Figuren 3 und 4 sind Variationen des am oberen Bereich 23.1 der Umfangswand befestigten Dichtungsteils dargestellt, das bei der Ausführungsform gemäß den Figuren 1 und 2 durch das Schlauchstück 33 gebildet ist, Bei der Ausführungsform gemäß Fig. 3 ist das Dichtungsteil durch eine Schwingplatte 36 und bei der Ausführungsform gemäß Fig. 4 durch einen Schieber 37 gebildet.FIGS. 3 and 4 show variations of the sealing part fastened to the upper region 23.1 of the peripheral wall, which is formed by the tube piece 33 in the embodiment according to FIGS. 1 and 2, in the embodiment 3, the sealing part is formed by a vibrating plate 36 and in the embodiment according to FIG. 4 by a slide 37.

Die Schwingplatte 36 der Ausführungsform gemäß Fig. 3 ist mit dem oberen Bereich 23.1 der Umfangswand über ein Gelenk 38 verbunden. Sie ist unten mit einem Dichtbelag 39 belegt, der abdichtend bis zum oberen Bereich 23.1 der Umfangswand übergeht. Der Dichtbelag 39 dichtet zur Mantelfläche 28 sowie zur Vorderwand 30 und zur Rückwand 31 und darüber hinaus zum oberen Bereich 23.1 ab. Damit die Schwingplatte 36 mit dem Dichtbelag 39 immer gut dichtend an der Mantelfläche 28 anliegt, wird sie durch eine Feder 40 in Richtung der Mantelfläche 28 gedrückt.The vibrating plate 36 of the embodiment according to FIG. 3 is connected to the upper region 23.1 of the peripheral wall via a joint 38. It is covered at the bottom with a sealing covering 39 which merges sealingly with the upper region 23.1 of the peripheral wall. The sealing covering 39 seals against the outer surface 28 and the front wall 30 and the rear wall 31 and, moreover, the upper region 23.1. So that the vibrating plate 36 with the sealing covering 39 always lies tightly against the outer surface 28, it is pressed by a spring 40 in the direction of the outer surface 28.

Bei der Ausführungsform gemäß Fig. 4 erstreckt sich der Schieber 37 über die gesamte Breite des Gehauseinnenraums von der Vorderwand 30 bis zur Rückwand 31. Er ist auf die Achse des Läufers 26 zugerichtet und ist in dieser Richtung verschiebbar in einer Führung 41 geführt, die mit dem oberen Bereich 23.1 der Umfangswand fest verbunden ist. Der Schieber 37 wird durch die Kraft einer Feder 40 auf die Mantelfläche 28 gedrückt.In the embodiment according to FIG. 4, the slide 37 extends over the entire width of the interior of the housing from the front wall 30 to the rear wall 31. It is oriented towards the axis of the rotor 26 and is displaceable in this direction in a guide 41 which is guided by the upper region 23.1 of the peripheral wall is firmly connected. The slide 37 is pressed onto the lateral surface 28 by the force of a spring 40.

Die Ausführungsformen gemäß den Figuren 3 und 4 haben gegenüber der Ausführungsform von Fig. 1 den Vorteil, daß durch die Kraft der jeweils verwendeten Feder 40 immer ein sicheres Anliegen des Dichtungsteiles _ Schwingplatte 36 bzw. Schieber 37 _ an der Mantelfläche 28 gewährleistet ist. Beim Verwenden des Schlauchstückes 33 kommt es dagegen bei höheren Drehzahlen zu Dichtungsproblemen. Dafür ist der Aufbau mit dem Schlauchstück 33 besonders einfach. Für langsame Drehzahlen ist er ausreichend.The embodiments according to FIGS. 3 and 4 have the advantage over the embodiment of FIG. 1 that the force of the spring 40 used in each case always ensures that the sealing part _ oscillating plate 36 or slide 37 _ lies securely on the lateral surface 28. When using the hose piece 33, however, there are sealing problems at higher speeds. For this, the construction with the tube piece 33 is particularly simple. It is sufficient for slow speeds.

Es wird darauf hingewiesen, daß es bei erfindungsgemäßen Pumpen nicht auf die Anordnung und Anzahl der verwendeten Quetschkörper ankommt, solange mindestens zwei Quetschkörper verwendet werden. Es können feststehende Quetschkörper sein, wie in Fig. 1 dargestellt, oder die Quetschkörper können kugelgelagerte Rollen sein. Die Quetschkörper können eine harte Oberfläche aufweisen, oder sie können entsprechend der Polsterschicht 25 auf dem Quetschbereich 23.2 der Umfangswand mit einem Polster versehen sein. Solche Polster dienen dazu, daß größere gepumpte Körper nicht durch die Wirkung der Quetschkörper zertrümmert werden, sondern daß diese, falls sie nicht in Förderrichtung ohne weiteres weitergeschoben werden, während des Durchlaufens eines Quetschkörpers in die Polsterschichten gedrückt werden. Der Antrieb der pumpen kann auf beliebige Art und Weise erfolgen. Es können auch Antriebe mit geringem Anlaufmoment verwendet werden, da bei allen erfindungsgemäßen Schlauchpumpen nur ein geringes Anlaufmoment erforderlich ist, da kein hartelastischer, selbstaufrichtender Schlauch verwendet werden muß.It is pointed out that the arrangement and number of the squeeze bodies used is not important in pumps according to the invention, as long as at least two squeeze bodies are used. It can be stationary squeeze bodies, as shown in Fig. 1, or the squeeze bodies can be ball-bearing rollers. The squeeze bodies can have a hard surface, or they can be provided with a cushion in accordance with the cushion layer 25 on the squish area 23.2 of the peripheral wall. Such pads serve to ensure that larger pumped bodies are not smashed by the action of the squeeze body, but rather that if they are not easily pushed in the conveying direction, they are pressed into the padding layers as they pass through a squeeze body. The pumps can be driven in any way. Drives with low starting torque can also be used, since only a low starting torque is required for all peristaltic pumps according to the invention, since no hard elastic, self-erecting hose has to be used.

Claims (5)

1. A hose-pump having
a) a housing with
a1) a suction union (20) and a pressure union (21),
a2) a peripheral wall which at least in a region (23.2) of constriction along the long connection between the suction union and the pressure union is made as a circular cylinder, and
a3) a plane front wall (30) and a plane rear wall (31),
b) a hose (24),
b1) which runs along the peripheral wall in the region of constriction between the suction union and the pressure union, and
b2) the circumference of which corresonds essentially with twice the distance between the front and rear walls,
c) a rotor (26),
c1) the axis of rotation of which coincides with the axis of the circular cylinder of the region of constriction of the peripheral wall, and
c2) which exhibits at least two constrictor bodies (27) arranged with axial symmetry, and
c3) turns so that each constrictor body squeezes the hose from the region of the suction union round towards the region of the presure union,
d) a sealing liquid (34) inside the housing and
e) a separator device which separates and seals a suction space (35), i.e., a space inside the pump in which reduced pressure prevails during pumping, from a pressure space (42) in which no reduced pressure prevails,
characterized in that
- the separator device exhibits a rotor sealing device (29) and an elastic seal (32; 36; 37),
- the rotor sealing device being connected solidly to the rotor and sealing it from the front and rear walls, and
- the elastic sealing device being arranged between the suction union and the pressure union and being made elastic in such a way that in the turning of the rotor it seals the constantly changing cross-section between the rotor and the peripheral wall as well as the front and rear walls.
2. A hose-pump as in Claim 1,
characterized in that
the rotor sealing device is formed by two sealing rings (29) which are fitted to the peripheral edges of the rotor (26) next the front wall (30) and rear wall (31) respectively.
3. A hose-pump as in Claim 1,
characterized in that
the elastic seal is formed by an elastic piece (33) of hose of which the axis lies in parallel with the axis of the rotor (26) and which extends from the front wall (30) to the rear wall (31).
4. A hose-pump as in Claim 1,
characterized in that
the elastic seal is formed by a spring-loaded rocking plate (36) of which the axis of oscillation lies in parallel with the axis of the rotor (26) and which extends from the front wall (30) to the rear wall (31) and rests tangentially against the rotor.
5. A hose-pump as in Claim 1,
characterized in that
the elastic seal is formed by a slider (37) which is pressed by a spring (40) against the rotor (26) and extends from the front wall (30) to the rear wall (31).
EP88901228A 1987-02-03 1988-02-02 Peristaltic pump Expired - Lifetime EP0334898B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT88901228T ATE62530T1 (en) 1987-02-03 1988-02-02 HOSE PUMP.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3703124 1987-02-03
DE19873703124 DE3703124A1 (en) 1987-02-03 1987-02-03 HOSE PUMP

Publications (2)

Publication Number Publication Date
EP0334898A1 EP0334898A1 (en) 1989-10-04
EP0334898B1 true EP0334898B1 (en) 1991-04-10

Family

ID=6320091

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88901228A Expired - Lifetime EP0334898B1 (en) 1987-02-03 1988-02-02 Peristaltic pump

Country Status (3)

Country Link
EP (1) EP0334898B1 (en)
DE (2) DE3703124A1 (en)
WO (1) WO1988005868A2 (en)

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IT1220167B (en) * 1987-12-18 1990-06-06 Renato Vicentini PERFECT VOLUMETRIC PUMP FOR LIQUID OR GASEOUS FLUIDS
JPH0740441B2 (en) * 1990-08-17 1995-05-01 株式会社小糸製作所 Automotive headlight device
DE4214917A1 (en) * 1992-05-11 1993-11-18 Allweiler Ag Peristaltic pump
DE4303319A1 (en) * 1993-02-05 1994-08-11 Putzmeister Maschf Vacuum pumping device
GB2325710B (en) * 1997-05-30 2001-10-10 Bredel Hose Pumps B V A peristaltic pump
US6099272A (en) * 1997-09-18 2000-08-08 Fsi International Peristaltic pump with flow control
FR2787835B1 (en) * 1998-12-23 2004-09-24 Centre Nat Rech Scient PERISTALTIC COMPRESSORS SUITABLE FOR NON-RELAXING POLARIZED GAS COMPRESSION
IL128289A (en) * 1999-01-29 2001-08-08 Peristal Tec Temed Ltd Compression or expansion device
FR2789736A1 (en) * 1999-02-11 2000-08-18 Joseph Ferrandez Peristaltic flow pump for pumping wine has pump cylinder with rolls driven by chain and pressing along oval or circular-shaped pipe
GB2349431B (en) * 1999-04-29 2002-06-12 Watson Marlow Ltd Peristaltic pumps
NL1012039C2 (en) * 1999-05-11 2000-11-14 Bornhoud B V Pump provided with airtight housing has first relatively flexible hose (18) against which first body is movable to compress it and cause fluid within it to move to one end
US20010016706A1 (en) * 1999-08-31 2001-08-23 Kurt D. Leukanech Peristaltic pump
DE10357320A1 (en) * 2003-12-05 2005-06-30 Crane Process Flow Technologies Gmbh Peristaltic pump with vacuum generation device
EP1784575A1 (en) * 2004-09-03 2007-05-16 Ismatec SA, Laboratoriumstechnik Peristaltic pump
NL2000032C2 (en) * 2006-03-20 2007-09-21 Bredel Hose Pumps B V Peristaltic pump, method for manufacturing a hose therefor, and hose for such a pump.
NL2000167C2 (en) * 2006-07-28 2008-01-29 Bredel Hose Pumps B V Peristaltic pump.
GB2495937A (en) * 2011-10-25 2013-05-01 Watson Marlow Ltd Peristaltic pump head with auxiliary leakage chamber
GB201421964D0 (en) * 2014-12-10 2015-01-21 Hodges & Drake Design Ltd Peristaltic pumps
DE102017104395A1 (en) 2017-03-02 2018-09-06 Qonqave Gmbh Pump device for conveying at least one conveying means
GB2602343B (en) 2020-12-24 2023-02-22 Hodges & Drake Design Ltd Peristaltic pumps

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GB713239A (en) * 1952-08-20 1954-08-04 Ames Crosta Mills & Company Lt Improvements in and relating to flexible tube pumps
FR1272699A (en) * 1960-10-19 1961-09-29 Simon Ltd Henry Advanced flexible tube pump
DE3320090A1 (en) * 1983-06-03 1984-12-06 Streicher, Irmgard, 7141 Beilstein Displacement pump
DE3320091A1 (en) * 1983-06-03 1984-12-06 Streicher, Irmgard, 7141 Beilstein HOSE PUMP

Also Published As

Publication number Publication date
WO1988005868A2 (en) 1988-08-11
DE3703124A1 (en) 1988-08-11
WO1988005868A3 (en) 1988-10-06
DE3862374D1 (en) 1991-05-16
EP0334898A1 (en) 1989-10-04

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